Mohamed Ahmed Youssef Abdalla

Citation:

Abdalla, M., K. Phang, and G. V. Eleftheriades, "A Bi-Directional Electronically Tunable CMOS Phase Shifter Using the High-Pass Topology", 2007 IEEE/MTT-S International Microwave Symposium, pp. 2173 - 2176, 3-8 June 2007.

Date Presented:

Abstract:

This paper presents an integrated phase shifter based on the high-pass L-C topology. The circuit utilizes both varactors and active inductors to extend the tuning range and achieve a low return loss. The high-pass topology results in a compact IC implementation, and allows phase compensation in series-fed antenna arrays utilizing this phase shifter. Furthermore, this approach allows integrating multiple stages on the same IC, without a significant size increase. A negative resistance is generated by the active inductor circuit, and is used to partially compensate the varactor losses. A test chip is fabricated in a standard 0.13μm CMOS process, and a phase tuning range of 96° is achieved at 4GHz, with a return loss better than -18dB across the entire tuning range. The phase shifter achieves a -2.2dBm input compression point and a 7.4dBm IIP3 while operating from a 1.5V supply.

Notes:

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